Final answer:
The family traveled a distance of 520 miles in the first 8 hours of their cross-country trip.
Step-by-step explanation:
To find the distance traveled in the first 8 hours, we can use the formula: distance = speed x time. Since the family traveled at an average speed of 65 mph, we can multiply this speed by the time of 8 hours to find the distance traveled.
distance = 65 mph x 8 hours = 520 miles
Therefore, the family traveled a distance of 520 miles in the first 8 hours of their cross-country trip.